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In this Nov. 6, 2017 photo, Paul Manafort, President Donald Trump's former campaign chairman, leaves the federal courthouse in Washington. Manafort and his deputy, Rick Gates, who were charged with violating federal money laundering, foreign lobbying and banking laws for behavior occurring as far back as 2012, have pleaded not guilty. (AP Photo/Jacquelyn Martin)

WASHINGTON — For months, commentators and officials describing special counsel Robert Mueller's investigation into ties between the Trump campaign and Russia have used words such as "collusion" and "coordination" to summarize the complicated federal probe.

President Donald Trump himself has latched onto the terms, declaring on Twitter last week that there had been "NO COLLUSION" after criminal charges were unveiled against three of his ex-campaign aides.

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